Like most football referees, Jonas Eriksson is employed on a full-time basis. But unlike his colleagues, he has the luxury that he could do it all for nothing because he's a multi-millionaire.

40-year-old Eriksson was the man in charge of Brazil's 4-1 win over Cameroon this morning and during the World Cup stands to make around $US40,000 to $US50,000 ($42,435 - $53,031) - for a month's work.

But luckily for Eriksson, he referees completely for the fun of it.

Multi-millionaire Eriksson refereed the game between Brazil and Cameroon. Photo: AP

Eriksson was appointed to his first international major tournament in 2012 and is respected for the way he officiates games.

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Seven years ago, Eriksson sold his 15 per cent stake in a Swedish sports media rights business for a reported £6 million ($10.837 million)

It's a large enough sum of money to get by for the rest of your life, but the former journalist pursued refereeing as a hobby, something he took great enjoyment out of.

World Cup 2014: Brazil v Cameroon highlights

He's had a whistle in his back pocket since 1994, but during that time he pursued a business career as one of three partners who owned the company IEC in Sports.

For referees, their progression to the highest echelon of decision making takes remarkable time and effort. For most though, it's an inherent love of the round ball that drives them to success. Some types would even go as far as saying it's the best job in the world; being able to watch football from the best seat in the house.

For Eriksson, that's exactly how he describes his job, which takes him all over the world.

"I've had a fantastic life as a businessman...but since 2011, I've dedicated myself to being a professional referee and I'm having the time of my life," Eriksson told UEFA last year.

"All the money hasn't changed anything, the best thing I do in my life is still refereeing football."

However, Eriksson's refereeing career hasn't been spared of controversy over the years. He angered Scotland manager Gordon Strachan in 2009 when he didn't give a crucial penalty in a Rangers' Champions League match against Sevilla, with Strachan saying the multi-millionaire "shouldn't get another game in the Champions League...he is not good enough".

Or the time he waved away Barcelona's cries for a string of penalties in the box in a goalless draw with AC Milan. The stage - a Champions League quarter-final in 2011-12.

Most referees do well to escape the criticism and constant public scrutiny in their line of work. Like professional athletes, referees only deal in one currency - strong performances on the field.

When these performances begin to taper away, just like a star forward who can't seem to slot one in the back of the net, the pressure of retaining your job begins to play on your mind.

One can't help but think that Eriksson's financial security combined with an indubitable passion for the game will be pave the way for long-term success on the world's biggest stage.